package Test;

/**
 * @author Alger
 * @date 2021/6/23  19:03
 */
public class Test01 {

}

abstract class a{
    int a(){
        return 1;
    }
}
interface b{
    int a();

}
class d implements b{
    @Override
    public int a() {
        return 0;
    }
}
